155635653220 has 12 divisors (see below), whose sum is σ = 326834871804. Its totient is φ = 62254261280.

The previous prime is 155635653209. The next prime is 155635653221. The reversal of 155635653220 is 22356536551.

It can be written as a sum of positive squares in 2 ways, for example, as 85900575744 + 69735077476 = 293088^2 + 264074^2 .

It is not an unprimeable number, because it can be changed into a prime (155635653221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3890891311 + ... + 3890891350.

It is an arithmetic number, because the mean of its divisors is an integer number (27236239317).

Almost surely, 2^155635653220 is an apocalyptic number.

155635653220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155635653220 is an abundant number, since it is smaller than the sum of its proper divisors (171199218584).

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

155635653220 is a wasteful number, since it uses less digits than its factorization.

155635653220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781782670 (or 7781782668 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 43.

The spelling of 155635653220 in words is "one hundred fifty-five billion, six hundred thirty-five million, six hundred fifty-three thousand, two hundred twenty".