155661142635 has 64 divisors (see below), whose sum is σ = 289512437760. Its totient is φ = 79270997760.

The previous prime is 155661142619. The next prime is 155661142691. The reversal of 155661142635 is 536241166551.

155661142635 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 6 + 1 + 1 + 4 + 2 + 635 = 666.

It is not a de Polignac number, because 155661142635 - 2⁴ = 155661142619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39037 + ... + 559326.

It is an arithmetic number, because the mean of its divisors is an integer number (4523631840).

Almost surely, 2^155661142635 is an apocalyptic number.

155661142635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155661142635 is a deficient number, since it is larger than the sum of its proper divisors (133851295125).

155661142635 is a wasteful number, since it uses less digits than its factorization.

155661142635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598465 (or 598459 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 155661142635 in words is "one hundred fifty-five billion, six hundred sixty-one million, one hundred forty-two thousand, six hundred thirty-five".