15631640054 has 4 divisors (see below), whose sum is σ = 23447460084. Its totient is φ = 7815820026.

The previous prime is 15631640053. The next prime is 15631640077. The reversal of 15631640054 is 45004613651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45004613651 = 3947 ⋅11402233.

It is a junction number, because it is equal to n+sod(n) for n = 15631639996 and 15631640023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15631640053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3907910012 + ... + 3907910015.

It is an arithmetic number, because the mean of its divisors is an integer number (5861865021).

Almost surely, 2^15631640054 is an apocalyptic number.

15631640054 is a deficient number, since it is larger than the sum of its proper divisors (7815820030).

15631640054 is an equidigital number, since it uses as much as digits as its factorization.

15631640054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815820029.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 15631640054 in words is "fifteen billion, six hundred thirty-one million, six hundred forty thousand, fifty-four".