16615530977 has 2 divisors, whose sum is σ = 16615530978. Its totient is φ = 16615530976.

The previous prime is 16615530931. The next prime is 16615530991. The reversal of 16615530977 is 77903551661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16609023376 + 6507601 = 128876^2 + 2551^2 .

It is a cyclic number.

It is not a de Polignac number, because 16615530977 - 2¹² = 16615526881 is a prime.

It is not a weakly prime, because it can be changed into another prime (16615530917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8307765488 + 8307765489.

It is an arithmetic number, because the mean of its divisors is an integer number (8307765489).

Almost surely, 2^16615530977 is an apocalyptic number.

It is an amenable number.

16615530977 is a deficient number, since it is larger than the sum of its proper divisors (1).

16615530977 is an equidigital number, since it uses as much as digits as its factorization.

16615530977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 16615530977 in words is "sixteen billion, six hundred fifteen million, five hundred thirty thousand, nine hundred seventy-seven".