42647642399 has 4 divisors (see below), whose sum is σ = 45156327264. Its totient is φ = 40138957536.

The previous prime is 42647642393. The next prime is 42647642417. The reversal of 42647642399 is 99324674624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42647642399 - 2²⁰ = 42646593823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42647642393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254342407 + ... + 1254342440.

It is an arithmetic number, because the mean of its divisors is an integer number (11289081816).

Almost surely, 2^42647642399 is an apocalyptic number.

42647642399 is a deficient number, since it is larger than the sum of its proper divisors (2508684865).

42647642399 is a wasteful number, since it uses less digits than its factorization.

42647642399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508684864.

The product of its digits is 15676416, while the sum is 56.

The spelling of 42647642399 in words is "forty-two billion, six hundred forty-seven million, six hundred forty-two thousand, three hundred ninety-nine".