15515442361 has 2 divisors, whose sum is σ = 15515442362. Its totient is φ = 15515442360.

The previous prime is 15515442329. The next prime is 15515442401. The reversal of 15515442361 is 16324451551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8244640000 + 7270802361 = 90800^2 + 85269^2 .

It is a cyclic number.

It is not a de Polignac number, because 15515442361 - 2⁵ = 15515442329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15515442361.

It is not a weakly prime, because it can be changed into another prime (15515442301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7757721180 + 7757721181.

It is an arithmetic number, because the mean of its divisors is an integer number (7757721181).

Almost surely, 2^15515442361 is an apocalyptic number.

It is an amenable number.

15515442361 is a deficient number, since it is larger than the sum of its proper divisors (1).

15515442361 is an equidigital number, since it uses as much as digits as its factorization.

15515442361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 37.

The spelling of 15515442361 in words is "fifteen billion, five hundred fifteen million, four hundred forty-two thousand, three hundred sixty-one".