155827431661 has 16 divisors (see below), whose sum is σ = 171739684800. Its totient is φ = 140212926720.

The previous prime is 155827431647. The next prime is 155827431701. The reversal of 155827431661 is 166134728551.

It is a cyclic number.

It is not a de Polignac number, because 155827431661 - 2³¹ = 153679948013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155827434661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295861 + ... + 631813.

It is an arithmetic number, because the mean of its divisors is an integer number (10733730300).

Almost surely, 2^155827431661 is an apocalyptic number.

155827431661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155827431661 is a deficient number, since it is larger than the sum of its proper divisors (15912253139).

155827431661 is a wasteful number, since it uses less digits than its factorization.

155827431661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336396.

The product of its digits is 1209600, while the sum is 49.

The spelling of 155827431661 in words is "one hundred fifty-five billion, eight hundred twenty-seven million, four hundred thirty-one thousand, six hundred sixty-one".