721084663378 has 16 divisors (see below), whose sum is σ = 1087823880000. Its totient is φ = 358479242352.

The previous prime is 721084663363. The next prime is 721084663427. The reversal of 721084663378 is 873366480127.

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, 65188 + ... + 1202671.

It is an arithmetic number, because the mean of its divisors is an integer number (67988992500).

Almost surely, 2^721084663378 is an apocalyptic number.

721084663378 is a deficient number, since it is larger than the sum of its proper divisors (366739216622).

721084663378 is a wasteful number, since it uses less digits than its factorization.

721084663378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269489.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 721084663378 in words is "seven hundred twenty-one billion, eighty-four million, six hundred sixty-three thousand, three hundred seventy-eight".