1572720672491 has 4 divisors (see below), whose sum is σ = 1596194115432. Its totient is φ = 1549247229552.

The previous prime is 1572720672487. The next prime is 1572720672493. The reversal of 1572720672491 is 1942760272751.

It is a happy number.

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 1572720672491 - 2² = 1572720672487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1572720672493) 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, 11736721370 + ... + 11736721503.

It is an arithmetic number, because the mean of its divisors is an integer number (399048528858).

Almost surely, 2^{1572720672491} is an apocalyptic number.

1572720672491 is a deficient number, since it is larger than the sum of its proper divisors (23473442941).

1572720672491 is an equidigital number, since it uses as much as digits as its factorization.

1572720672491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23473442940.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 1572720672491 in words is "one trillion, five hundred seventy-two billion, seven hundred twenty million, six hundred seventy-two thousand, four hundred ninety-one".