65131556 has 48 divisors (see below), whose sum is σ = 138692736. Its totient is φ = 26125824.

The previous prime is 65131543. The next prime is 65131579. The reversal of 65131556 is 65513156.

It is a super-2 number, since 2×65131556² = 8484239173962272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139235 + ... + 139701.

It is an arithmetic number, because the mean of its divisors is an integer number (2889432).

Almost surely, 2^65131556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65131556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69346368).

65131556 is an abundant number, since it is smaller than the sum of its proper divisors (73561180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65131556 is a wasteful number, since it uses less digits than its factorization.

65131556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 786 counting only the distinct ones).

The product of its digits is 13500, while the sum is 32.

The square root of 65131556 is about 8070.4123810373. The cubic root of 65131556 is about 402.3436497790.

The spelling of 65131556 in words is "sixty-five million, one hundred thirty-one thousand, five hundred fifty-six".