642644602450 has 24 divisors (see below), whose sum is σ = 1200320317440. Its totient is φ = 255982280400.

The previous prime is 642644602429. The next prime is 642644602471. The reversal of 642644602450 is 54206446246.

It is an interprime number because it is at equal distance from previous prime (642644602429) and next prime (642644602471).

It is a junction number, because it is equal to n+sod(n) for n = 642644602397 and 642644602406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26876946 + ... + 26900845.

It is an arithmetic number, because the mean of its divisors is an integer number (50013346560).

Almost surely, 2^642644602450 is an apocalyptic number.

642644602450 is a deficient number, since it is larger than the sum of its proper divisors (557675714990).

642644602450 is a wasteful number, since it uses less digits than its factorization.

642644602450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53778042 (or 53778037 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 43.

The spelling of 642644602450 in words is "six hundred forty-two billion, six hundred forty-four million, six hundred two thousand, four hundred fifty".