747720531651 has 32 divisors (see below), whose sum is σ = 1007620508160. Its totient is φ = 493182823424.

The previous prime is 747720531637. The next prime is 747720531653. The reversal of 747720531651 is 156135027747.

It is a cyclic number.

It is not a de Polignac number, because 747720531651 - 2⁶ = 747720531587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 747720531651.

It is not an unprimeable number, because it can be changed into a prime (747720531653) 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, 136367956 + ... + 136373438.

It is an arithmetic number, because the mean of its divisors is an integer number (31488140880).

Almost surely, 2^747720531651 is an apocalyptic number.

747720531651 is a deficient number, since it is larger than the sum of its proper divisors (259899976509).

747720531651 is a wasteful number, since it uses less digits than its factorization.

747720531651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 747720531651 in words is "seven hundred forty-seven billion, seven hundred twenty million, five hundred thirty-one thousand, six hundred fifty-one".