155401700081 has 2 divisors, whose sum is σ = 155401700082. Its totient is φ = 155401700080.

The previous prime is 155401699987. The next prime is 155401700089. The reversal of 155401700081 is 180007104551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150686817856 + 4714882225 = 388184^2 + 68665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155401700081 is a prime.

It is a super-2 number, since 2×155401700081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155401700089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77700850040 + 77700850041.

It is an arithmetic number, because the mean of its divisors is an integer number (77700850041).

Almost surely, 2^155401700081 is an apocalyptic number.

It is an amenable number.

155401700081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155401700081 is an equidigital number, since it uses as much as digits as its factorization.

155401700081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 32.

The spelling of 155401700081 in words is "one hundred fifty-five billion, four hundred one million, seven hundred thousand, eighty-one".