65156056691 has 16 divisors (see below), whose sum is σ = 71245899648. Its totient is φ = 59094115200.

The previous prime is 65156056639. The next prime is 65156056709. The reversal of 65156056691 is 19665065156.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65156056691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65156056591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17322251 + ... + 17326011.

It is an arithmetic number, because the mean of its divisors is an integer number (4452868728).

Almost surely, 2^65156056691 is an apocalyptic number.

65156056691 is a deficient number, since it is larger than the sum of its proper divisors (6089842957).

65156056691 is a wasteful number, since it uses less digits than its factorization.

65156056691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7042.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 65156056691 in words is "sixty-five billion, one hundred fifty-six million, fifty-six thousand, six hundred ninety-one".