155598971513 has 2 divisors, whose sum is σ = 155598971514. Its totient is φ = 155598971512.

The previous prime is 155598971501. The next prime is 155598971527. The reversal of 155598971513 is 315179895551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150825819769 + 4773151744 = 388363^2 + 69088^2 .

It is a cyclic number.

It is not a de Polignac number, because 155598971513 - 2²² = 155594777209 is a prime.

It is a super-2 number, since 2×155598971513² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155598941513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77799485756 + 77799485757.

It is an arithmetic number, because the mean of its divisors is an integer number (77799485757).

Almost surely, 2^155598971513 is an apocalyptic number.

It is an amenable number.

155598971513 is a deficient number, since it is larger than the sum of its proper divisors (1).

155598971513 is an equidigital number, since it uses as much as digits as its factorization.

155598971513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505000, while the sum is 59.

The spelling of 155598971513 in words is "one hundred fifty-five billion, five hundred ninety-eight million, nine hundred seventy-one thousand, five hundred thirteen".