1516513015561 has 2 divisors, whose sum is σ = 1516513015562. Its totient is φ = 1516513015560.

The previous prime is 1516513015517. The next prime is 1516513015573. The reversal of 1516513015561 is 1655103156151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1170128975625 + 346384039936 = 1081725^2 + 588544^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516513015561 - 2²³ = 1516504626953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1511513015561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758256507780 + 758256507781.

It is an arithmetic number, because the mean of its divisors is an integer number (758256507781).

Almost surely, 2^{1516513015561} is an apocalyptic number.

It is an amenable number.

1516513015561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516513015561 is an equidigital number, since it uses as much as digits as its factorization.

1516513015561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67500, while the sum is 40.

The spelling of 1516513015561 in words is "one trillion, five hundred sixteen billion, five hundred thirteen million, fifteen thousand, five hundred sixty-one".