642261244625 has 64 divisors (see below), whose sum is σ = 1076196506112. Its totient is φ = 369572832000.

The previous prime is 642261244591. The next prime is 642261244627. The reversal of 642261244625 is 526442162246.

It is not a de Polignac number, because 642261244625 - 2¹² = 642261240529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642261244627) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2441354 + ... + 2691603.

It is an arithmetic number, because the mean of its divisors is an integer number (16815570408).

Almost surely, 2^642261244625 is an apocalyptic number.

642261244625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642261244625 is a deficient number, since it is larger than the sum of its proper divisors (433935261487).

642261244625 is a wasteful number, since it uses less digits than its factorization.

642261244625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133003 (or 5132993 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 44.

The spelling of 642261244625 in words is "six hundred forty-two billion, two hundred sixty-one million, two hundred forty-four thousand, six hundred twenty-five".