721677231547 has 4 divisors (see below), whose sum is σ = 721759407840. Its totient is φ = 721595055256.

The previous prime is 721677231493. The next prime is 721677231557. The reversal of 721677231547 is 745132776127.

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 721677231547 - 2⁷ = 721677231419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721677231494 and 721677231503.

It is not an unprimeable number, because it can be changed into a prime (721677231557) 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, 41074972 + ... + 41092537.

It is an arithmetic number, because the mean of its divisors is an integer number (180439851960).

Almost surely, 2^721677231547 is an apocalyptic number.

721677231547 is a deficient number, since it is larger than the sum of its proper divisors (82176293).

721677231547 is an equidigital number, since it uses as much as digits as its factorization.

721677231547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82176292.

The product of its digits is 3457440, while the sum is 52.

The spelling of 721677231547 in words is "seven hundred twenty-one billion, six hundred seventy-seven million, two hundred thirty-one thousand, five hundred forty-seven".