65615501651 has 4 divisors (see below), whose sum is σ = 74989144752. Its totient is φ = 56241858552.

The previous prime is 65615501639. The next prime is 65615501671. The reversal of 65615501651 is 15610551656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65615501651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65615501599 and 65615501608.

It is not an unprimeable number, because it can be changed into a prime (65615501671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4686821540 + ... + 4686821553.

It is an arithmetic number, because the mean of its divisors is an integer number (18747286188).

Almost surely, 2^65615501651 is an apocalyptic number.

65615501651 is a deficient number, since it is larger than the sum of its proper divisors (9373643101).

65615501651 is an equidigital number, since it uses as much as digits as its factorization.

65615501651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373643100.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 65615501651 in words is "sixty-five billion, six hundred fifteen million, five hundred one thousand, six hundred fifty-one".