78507457422131 has 4 divisors (see below), whose sum is σ = 78507475344792. Its totient is φ = 78507439499472.

The previous prime is 78507457422113. The next prime is 78507457422157. The reversal of 78507457422131 is 13122475470587.

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

It is a cyclic number.

It is not a de Polignac number, because 78507457422131 - 2⁴² = 74109410911027 is a prime.

It is a super-2 number, since 2×78507457422131² (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 (78507457422431) 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, 2469335 + ... + 12771551.

It is an arithmetic number, because the mean of its divisors is an integer number (19626868836198).

Almost surely, 2^{78507457422131} is an apocalyptic number.

78507457422131 is a deficient number, since it is larger than the sum of its proper divisors (17922661).

78507457422131 is a wasteful number, since it uses less digits than its factorization.

78507457422131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17922660.

The product of its (nonzero) digits is 13171200, while the sum is 56.

The spelling of 78507457422131 in words is "seventy-eight trillion, five hundred seven billion, four hundred fifty-seven million, four hundred twenty-two thousand, one hundred thirty-one".