155661166100 has 36 divisors (see below), whose sum is σ = 368492435808. Its totient is φ = 56604060000.

The previous prime is 155661166081. The next prime is 155661166121. The reversal of 155661166100 is 1661166551.

It is a super-2 number, since 2×155661166100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70753976 + ... + 70756175.

Almost surely, 2^155661166100 is an apocalyptic number.

155661166100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155661166100 is an abundant number, since it is smaller than the sum of its proper divisors (212831269708).

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

155661166100 is a wasteful number, since it uses less digits than its factorization.

155661166100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141510176 (or 141510169 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 155661166100 in words is "one hundred fifty-five billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred".