16620770765 has 16 divisors (see below), whose sum is σ = 20089902000. Its totient is φ = 13200302592.

The previous prime is 16620770741. The next prime is 16620770827. The reversal of 16620770765 is 56707702661.

It can be written as a sum of positive squares in 8 ways, for example, as 349727401 + 16271043364 = 18701^2 + 127558^2 .

It is a cyclic number.

It is not a de Polignac number, because 16620770765 - 2⁶ = 16620770701 is a prime.

It is a congruent number.

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, 378809 + ... + 420401.

It is an arithmetic number, because the mean of its divisors is an integer number (1255618875).

Almost surely, 2^16620770765 is an apocalyptic number.

It is an amenable number.

16620770765 is a deficient number, since it is larger than the sum of its proper divisors (3469131235).

16620770765 is a wasteful number, since it uses less digits than its factorization.

16620770765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42176.

The product of its (nonzero) digits is 740880, while the sum is 47.

The spelling of 16620770765 in words is "sixteen billion, six hundred twenty million, seven hundred seventy thousand, seven hundred sixty-five".