65401556 has 12 divisors (see below), whose sum is σ = 124857600. Its totient is φ = 29727960.

The previous prime is 65401547. The next prime is 65401597. The reversal of 65401556 is 65510456.

It is a super-2 number, since 2×65401556² = 8554727054442272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743156 + ... + 743243.

It is an arithmetic number, because the mean of its divisors is an integer number (10404800).

Almost surely, 2^65401556 is an apocalyptic number.

It is an amenable number.

65401556 is a deficient number, since it is larger than the sum of its proper divisors (59456044).

65401556 is a wasteful number, since it uses less digits than its factorization.

65401556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486414 (or 1486412 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 65401556 is about 8087.1228505569. The cubic root of 65401556 is about 402.8988492657.

Subtracting 65401556 from its reverse (65510456), we obtain a square (108900 = 330²).

The spelling of 65401556 in words is "sixty-five million, four hundred one thousand, five hundred fifty-six".