15499949077 has 2 divisors, whose sum is σ = 15499949078. Its totient is φ = 15499949076.

The previous prime is 15499949071. The next prime is 15499949089. The reversal of 15499949077 is 77094999451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10087992721 + 5411956356 = 100439^2 + 73566^2 .

It is a cyclic number.

It is not a de Polignac number, because 15499949077 - 2³¹ = 13352465429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15499949071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7749974538 + 7749974539.

It is an arithmetic number, because the mean of its divisors is an integer number (7749974539).

Almost surely, 2^15499949077 is an apocalyptic number.

It is an amenable number.

15499949077 is a deficient number, since it is larger than the sum of its proper divisors (1).

15499949077 is an equidigital number, since it uses as much as digits as its factorization.

15499949077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25719120, while the sum is 64.

The spelling of 15499949077 in words is "fifteen billion, four hundred ninety-nine million, nine hundred forty-nine thousand, seventy-seven".