721674474376461 has 32 divisors (see below), whose sum is σ = 1007878061887488. Its totient is φ = 458935702305600.

The previous prime is 721674474376439. The next prime is 721674474376507. The reversal of 721674474376461 is 164673474476127.

It is a happy number.

It is not a de Polignac number, because 721674474376461 - 2⁹ = 721674474375949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721674474376411) 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, 318642831 + ... + 320899676.

It is an arithmetic number, because the mean of its divisors is an integer number (31496189433984).

Almost surely, 2^{721674474376461} is an apocalyptic number.

It is an amenable number.

721674474376461 is a deficient number, since it is larger than the sum of its proper divisors (286203587511027).

721674474376461 is a wasteful number, since it uses less digits than its factorization.

721674474376461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639542761.

The product of its digits is 796594176, while the sum is 69.

The spelling of 721674474376461 in words is "seven hundred twenty-one trillion, six hundred seventy-four billion, four hundred seventy-four million, three hundred seventy-six thousand, four hundred sixty-one".