15640553403420 has 96 divisors (see below), whose sum is σ = 47775649049856. Its totient is φ = 3791580441600.

The previous prime is 15640553403407. The next prime is 15640553403421. The reversal of 15640553403420 is 2430435504651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640553403421) 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, 42596415 + ... + 42962025.

It is an arithmetic number, because the mean of its divisors is an integer number (497663010936).

Almost surely, 2^{15640553403420} is an apocalyptic number.

15640553403420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15640553403420 is an abundant number, since it is smaller than the sum of its proper divisors (32135095646436).

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

15640553403420 is a wasteful number, since it uses less digits than its factorization.

15640553403420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430451 (or 430449 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 15640553403420 in words is "fifteen trillion, six hundred forty billion, five hundred fifty-three million, four hundred three thousand, four hundred twenty".