74347921657 has 4 divisors (see below), whose sum is σ = 74349198580. Its totient is φ = 74346644736.

The previous prime is 74347921603. The next prime is 74347921733. The reversal of 74347921657 is 75612974347.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46077198336 + 28270723321 = 214656^2 + 168139^2 .

It is a cyclic number.

It is not a de Polignac number, because 74347921657 - 2¹¹ = 74347919609 is a prime.

It is a super-2 number, since 2×74347921657² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74347921598 and 74347921607.

It is not an unprimeable number, because it can be changed into a prime (74347921157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546732 + ... + 669037.

It is an arithmetic number, because the mean of its divisors is an integer number (18587299645).

Almost surely, 2^74347921657 is an apocalyptic number.

It is an amenable number.

74347921657 is a deficient number, since it is larger than the sum of its proper divisors (1276923).

74347921657 is a wasteful number, since it uses less digits than its factorization.

74347921657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276922.

The product of its digits is 8890560, while the sum is 55.

It can be divided in two parts, 74347 and 921657, that added together give a square (996004 = 998²).

The spelling of 74347921657 in words is "seventy-four billion, three hundred forty-seven million, nine hundred twenty-one thousand, six hundred fifty-seven".