674723740356721 has 16 divisors (see below), whose sum is σ = 759813815720448. Its totient is φ = 593592653577600.

The previous prime is 674723740356703. The next prime is 674723740356779. The reversal of 674723740356721 is 127653047327476.

It is a cyclic number.

It is not a de Polignac number, because 674723740356721 - 2¹⁵ = 674723740323953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674723740356521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24363621 + ... + 44079853.

It is an arithmetic number, because the mean of its divisors is an integer number (47488363482528).

Almost surely, 2^{674723740356721} is an apocalyptic number.

It is an amenable number.

674723740356721 is a deficient number, since it is larger than the sum of its proper divisors (85090075363727).

674723740356721 is a wasteful number, since it uses less digits than its factorization.

674723740356721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19816632.

The product of its (nonzero) digits is 248935680, while the sum is 64.

The spelling of 674723740356721 in words is "six hundred seventy-four trillion, seven hundred twenty-three billion, seven hundred forty million, three hundred fifty-six thousand, seven hundred twenty-one".