155126507681 has 2 divisors, whose sum is σ = 155126507682. Its totient is φ = 155126507680.

The previous prime is 155126507629. The next prime is 155126507693. The reversal of 155126507681 is 186705621551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152190493456 + 2936014225 = 390116^2 + 54185^2 .

It is a cyclic number.

It is not a de Polignac number, because 155126507681 - 2⁶ = 155126507617 is a prime.

It is a super-2 number, since 2×155126507681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155126507381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77563253840 + 77563253841.

It is an arithmetic number, because the mean of its divisors is an integer number (77563253841).

Almost surely, 2^155126507681 is an apocalyptic number.

It is an amenable number.

155126507681 is a deficient number, since it is larger than the sum of its proper divisors (1).

155126507681 is an equidigital number, since it uses as much as digits as its factorization.

155126507681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 155126507681 in words is "one hundred fifty-five billion, one hundred twenty-six million, five hundred seven thousand, six hundred eighty-one".