155516212071 has 18 divisors (see below), whose sum is σ = 246912334760. Its totient is φ = 94252249080.

The previous prime is 155516212057. The next prime is 155516212073. The reversal of 155516212071 is 170212615551.

155516212071 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 1 + 621 + 20 + 7 + 1 = 666.

It is not a de Polignac number, because 155516212071 - 2²⁵ = 155482657639 is a prime.

It is a super-2 number, since 2×155516212071² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155516212073) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71402131 + ... + 71404308.

Almost surely, 2^155516212071 is an apocalyptic number.

155516212071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155516212071 is a deficient number, since it is larger than the sum of its proper divisors (91396122689).

155516212071 is a wasteful number, since it uses less digits than its factorization.

155516212071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142806467 (or 142806453 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 36.

The spelling of 155516212071 in words is "one hundred fifty-five billion, five hundred sixteen million, two hundred twelve thousand, seventy-one".