74858159547721 has 9 divisors (see below), whose sum is σ = 82282213866349. Its totient is φ = 68052785795500.

The previous prime is 74858159547679. The next prime is 74858159547751. The reversal of 74858159547721 is 12774595185847.

It is a happy number.

The square root of 74858159547721 is 8652061.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 74858159547721 - 2⁹ = 74858159547209 is a prime.

It is a super-2 number, since 2×74858159547721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74858159547751) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 94779396 + ... + 95565946.

Almost surely, 2^{74858159547721} is an apocalyptic number.

74858159547721 is the 8652061-st square number.

74858159547721 is the 4326031-st centered octagonal number.

It is an amenable number.

74858159547721 is a deficient number, since it is larger than the sum of its proper divisors (7424054318628).

74858159547721 is an frugal number, since it uses more digits than its factorization.

74858159547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573124 (or 786562 counting only the distinct ones).

The product of its digits is 790272000, while the sum is 73.

The spelling of 74858159547721 in words is "seventy-four trillion, eight hundred fifty-eight billion, one hundred fifty-nine million, five hundred forty-seven thousand, seven hundred twenty-one".