155355661431 has 48 divisors (see below), whose sum is σ = 229650220800. Its totient is φ = 101182421376.

The previous prime is 155355661427. The next prime is 155355661451. The reversal of 155355661431 is 134166553551.

155355661431 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 556 + 61 + 4 + 31 = 666.

It is not a de Polignac number, because 155355661431 - 2² = 155355661427 is a prime.

It is a super-2 number, since 2×155355661431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155355661411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27305235 + ... + 27310923.

It is an arithmetic number, because the mean of its divisors is an integer number (4784379600).

Almost surely, 2^155355661431 is an apocalyptic number.

155355661431 is a deficient number, since it is larger than the sum of its proper divisors (74294559369).

155355661431 is a wasteful number, since it uses less digits than its factorization.

155355661431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180 (or 6177 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The spelling of 155355661431 in words is "one hundred fifty-five billion, three hundred fifty-five million, six hundred sixty-one thousand, four hundred thirty-one".