78261513983 has 8 divisors (see below), whose sum is σ = 81670118400. Its totient is φ = 74853403768.

The previous prime is 78261513971. The next prime is 78261513991. The reversal of 78261513983 is 38931516287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78261513983 - 2⁸ = 78261513727 is a prime.

It is a super-2 number, since 2×78261513983² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78261513923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220478 + ... + 452916.

It is an arithmetic number, because the mean of its divisors is an integer number (10208764800).

Almost surely, 2^78261513983 is an apocalyptic number.

78261513983 is a deficient number, since it is larger than the sum of its proper divisors (3408604417).

78261513983 is a wasteful number, since it uses less digits than its factorization.

78261513983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247101.

The product of its digits is 2177280, while the sum is 53.

The spelling of 78261513983 in words is "seventy-eight billion, two hundred sixty-one million, five hundred thirteen thousand, nine hundred eighty-three".