79158527421 has 16 divisors (see below), whose sum is σ = 106645776384. Its totient is φ = 52221947904.

The previous prime is 79158527419. The next prime is 79158527533. The reversal of 79158527421 is 12472585197.

It is a happy number.

It is not a de Polignac number, because 79158527421 - 2¹ = 79158527419 is a prime.

It is a super-2 number, since 2×79158527421² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79158527401) 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, 4377220 + ... + 4395266.

It is an arithmetic number, because the mean of its divisors is an integer number (6665361024).

Almost surely, 2^79158527421 is an apocalyptic number.

It is an amenable number.

79158527421 is a deficient number, since it is larger than the sum of its proper divisors (27487248963).

79158527421 is a wasteful number, since it uses less digits than its factorization.

79158527421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33220.

The product of its digits is 1411200, while the sum is 51.

The spelling of 79158527421 in words is "seventy-nine billion, one hundred fifty-eight million, five hundred twenty-seven thousand, four hundred twenty-one".