65638473879 has 32 divisors (see below), whose sum is σ = 99544227840. Its totient is φ = 38106633600.

The previous prime is 65638473877. The next prime is 65638473881. The reversal of 65638473879 is 97837483656.

65638473879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65638473877) and next prime (65638473881).

It is not a de Polignac number, because 65638473879 - 2¹ = 65638473877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65638473871) 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, 148492 + ... + 391569.

It is an arithmetic number, because the mean of its divisors is an integer number (3110757120).

Almost surely, 2^65638473879 is an apocalyptic number.

65638473879 is a deficient number, since it is larger than the sum of its proper divisors (33905753961).

65638473879 is a wasteful number, since it uses less digits than its factorization.

65638473879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540231.

The product of its digits is 182891520, while the sum is 66.

The spelling of 65638473879 in words is "sixty-five billion, six hundred thirty-eight million, four hundred seventy-three thousand, eight hundred seventy-nine".