642370155642655 has 16 divisors (see below), whose sum is σ = 851565499776000. Its totient is φ = 461264645705760.

The previous prime is 642370155642637. The next prime is 642370155642673. The reversal of 642370155642655 is 556246551073246.

It is an interprime number because it is at equal distance from previous prime (642370155642637) and next prime (642370155642673).

It is not a de Polignac number, because 642370155642655 - 2¹⁵ = 642370155609887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642370155642593 and 642370155642602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73920611955 + ... + 73920620644.

It is an arithmetic number, because the mean of its divisors is an integer number (53222843736000).

Almost surely, 2^{642370155642655} is an apocalyptic number.

642370155642655 is a deficient number, since it is larger than the sum of its proper divisors (209195344133345).

642370155642655 is a wasteful number, since it uses less digits than its factorization.

642370155642655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147841232694.

The product of its (nonzero) digits is 181440000, while the sum is 61.

The spelling of 642370155642655 in words is "six hundred forty-two trillion, three hundred seventy billion, one hundred fifty-five million, six hundred forty-two thousand, six hundred fifty-five".