78450461531 has 16 divisors (see below), whose sum is σ = 86565642240. Its totient is φ = 70633313280.

The previous prime is 78450461503. The next prime is 78450461563. The reversal of 78450461531 is 13516405487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78450461531 is a prime.

It is a super-2 number, since 2×78450461531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78450460531) 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, 2714051 + ... + 2742803.

It is an arithmetic number, because the mean of its divisors is an integer number (5410352640).

Almost surely, 2^78450461531 is an apocalyptic number.

78450461531 is a deficient number, since it is larger than the sum of its proper divisors (8115180709).

78450461531 is a wasteful number, since it uses less digits than its factorization.

78450461531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33926.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 78450461531 in words is "seventy-eight billion, four hundred fifty million, four hundred sixty-one thousand, five hundred thirty-one".