120643252155 has 24 divisors (see below), whose sum is σ = 209652571440. Its totient is φ = 64177652160.

The previous prime is 120643252127. The next prime is 120643252183. The reversal of 120643252155 is 551252346021.

120643252155 is a `hidden beast` number, since 1 + 2 + 0 + 6 + 432 + 5 + 215 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (120643252127) and next prime (120643252183).

It is not a de Polignac number, because 120643252155 - 2⁵ = 120643252123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3428461 + ... + 3463470.

It is an arithmetic number, because the mean of its divisors is an integer number (8735523810).

Almost surely, 2^120643252155 is an apocalyptic number.

120643252155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120643252155 is a deficient number, since it is larger than the sum of its proper divisors (89009319285).

120643252155 is a wasteful number, since it uses less digits than its factorization.

120643252155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892331 (or 6892328 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 120643252155 its reverse (551252346021), we get a palindrome (671895598176).

The spelling of 120643252155 in words is "one hundred twenty billion, six hundred forty-three million, two hundred fifty-two thousand, one hundred fifty-five".