721651018852 has 24 divisors (see below), whose sum is σ = 1268629316640. Its totient is φ = 359188025280.

The previous prime is 721651018799. The next prime is 721651018889. The reversal of 721651018852 is 258810156127.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830323 + ... + 1460389.

It is an arithmetic number, because the mean of its divisors is an integer number (52859554860).

Almost surely, 2^721651018852 is an apocalyptic number.

It is an amenable number.

721651018852 is a deficient number, since it is larger than the sum of its proper divisors (546978297788).

721651018852 is a wasteful number, since it uses less digits than its factorization.

721651018852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631371 (or 631369 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 721651018852 in words is "seven hundred twenty-one billion, six hundred fifty-one million, eighteen thousand, eight hundred fifty-two".