65640554 has 16 divisors (see below), whose sum is σ = 118449600. Its totient is φ = 26650944.

The previous prime is 65640539. The next prime is 65640557. The reversal of 65640554 is 45504656.

It is not an unprimeable number, because it can be changed into a prime (65640557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123119 + ... + 123650.

It is an arithmetic number, because the mean of its divisors is an integer number (7403100).

Almost surely, 2^65640554 is an apocalyptic number.

65640554 is a deficient number, since it is larger than the sum of its proper divisors (52809046).

65640554 is a wasteful number, since it uses less digits than its factorization.

65640554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246797.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 65640554 is about 8101.8858298547. The cubic root of 65640554 is about 403.3890259973.

The spelling of 65640554 in words is "sixty-five million, six hundred forty thousand, five hundred fifty-four".