155117210971 has 2 divisors, whose sum is σ = 155117210972. Its totient is φ = 155117210970.

The previous prime is 155117210929. The next prime is 155117210987. The reversal of 155117210971 is 179012711551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155117210971 - 2⁹ = 155117210459 is a prime.

It is a super-2 number, since 2×155117210971² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155117211971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77558605485 + 77558605486.

It is an arithmetic number, because the mean of its divisors is an integer number (77558605486).

Almost surely, 2^155117210971 is an apocalyptic number.

155117210971 is a deficient number, since it is larger than the sum of its proper divisors (1).

155117210971 is an equidigital number, since it uses as much as digits as its factorization.

155117210971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 40.

The spelling of 155117210971 in words is "one hundred fifty-five billion, one hundred seventeen million, two hundred ten thousand, nine hundred seventy-one".