155506561650 has 72 divisors (see below), whose sum is σ = 455775609744. Its totient is φ = 37698559200.

The previous prime is 155506561649. The next prime is 155506561741. The reversal of 155506561650 is 56165605551.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155506561596 and 155506561605.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15702784 + ... + 15712683.

It is an arithmetic number, because the mean of its divisors is an integer number (6330216802).

Almost surely, 2^155506561650 is an apocalyptic number.

155506561650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155506561650 is an abundant number, since it is smaller than the sum of its proper divisors (300269048094).

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

155506561650 is a wasteful number, since it uses less digits than its factorization.

155506561650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31415496 (or 31415488 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 155506561650 in words is "one hundred fifty-five billion, five hundred six million, five hundred sixty-one thousand, six hundred fifty".