65607406638 has 64 divisors (see below), whose sum is σ = 147362561280. Its totient is φ = 19350489600.

The previous prime is 65607406633. The next prime is 65607406703. The reversal of 65607406638 is 83660470656.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65607406633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124668 + ... + 383088.

It is an arithmetic number, because the mean of its divisors is an integer number (2302540020).

Almost surely, 2^65607406638 is an apocalyptic number.

65607406638 is an abundant number, since it is smaller than the sum of its proper divisors (81755154642).

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

65607406638 is a wasteful number, since it uses less digits than its factorization.

65607406638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258593.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 65607406638 in words is "sixty-five billion, six hundred seven million, four hundred six thousand, six hundred thirty-eight".