155511666012 has 12 divisors (see below), whose sum is σ = 362860554056. Its totient is φ = 51837222000.

The previous prime is 155511665987. The next prime is 155511666017. The reversal of 155511666012 is 210666115551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155511666017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479652739 + ... + 6479652762.

Almost surely, 2^155511666012 is an apocalyptic number.

155511666012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155511666012 is an abundant number, since it is smaller than the sum of its proper divisors (207348888044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155511666012 is a wasteful number, since it uses less digits than its factorization.

155511666012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959305508 (or 12959305506 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 155511666012 in words is "one hundred fifty-five billion, five hundred eleven million, six hundred sixty-six thousand, twelve".