15420673491 has 4 divisors (see below), whose sum is σ = 20560897992. Its totient is φ = 10280448992.

The previous prime is 15420673487. The next prime is 15420673553. The reversal of 15420673491 is 19437602451.

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 15420673491 - 2² = 15420673487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15420673441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570112246 + ... + 2570112251.

It is an arithmetic number, because the mean of its divisors is an integer number (5140224498).

Almost surely, 2^15420673491 is an apocalyptic number.

15420673491 is a deficient number, since it is larger than the sum of its proper divisors (5140224501).

15420673491 is an equidigital number, since it uses as much as digits as its factorization.

15420673491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140224500.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 15420673491 in words is "fifteen billion, four hundred twenty million, six hundred seventy-three thousand, four hundred ninety-one".