15391752977 has 2 divisors, whose sum is σ = 15391752978. Its totient is φ = 15391752976.

The previous prime is 15391752947. The next prime is 15391753009. The reversal of 15391752977 is 77925719351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15180457681 + 211295296 = 123209^2 + 14536^2 .

It is a cyclic number.

It is not a de Polignac number, because 15391752977 - 2¹⁰ = 15391751953 is a prime.

It is not a weakly prime, because it can be changed into another prime (15391752917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7695876488 + 7695876489.

It is an arithmetic number, because the mean of its divisors is an integer number (7695876489).

Almost surely, 2^15391752977 is an apocalyptic number.

It is an amenable number.

15391752977 is a deficient number, since it is larger than the sum of its proper divisors (1).

15391752977 is an equidigital number, since it uses as much as digits as its factorization.

15391752977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4167450, while the sum is 56.

The spelling of 15391752977 in words is "fifteen billion, three hundred ninety-one million, seven hundred fifty-two thousand, nine hundred seventy-seven".