16505572077 has 12 divisors (see below), whose sum is σ = 23863248864. Its totient is φ = 10993622280.

The previous prime is 16505572043. The next prime is 16505572151. The reversal of 16505572077 is 77027550561.

It is a happy number.

16505572077 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 5 + 572 + 0 + 77 = 666.

It is not a de Polignac number, because 16505572077 - 2¹⁰ = 16505571053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505532077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 830673 + ... + 850310.

It is an arithmetic number, because the mean of its divisors is an integer number (1988604072).

Almost surely, 2^16505572077 is an apocalyptic number.

It is an amenable number.

16505572077 is a deficient number, since it is larger than the sum of its proper divisors (7357676787).

16505572077 is a wasteful number, since it uses less digits than its factorization.

16505572077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682080 (or 1682077 counting only the distinct ones).

The product of its (nonzero) digits is 514500, while the sum is 45.

The spelling of 16505572077 in words is "sixteen billion, five hundred five million, five hundred seventy-two thousand, seventy-seven".