78203831251 has 16 divisors (see below), whose sum is σ = 96314738688. Its totient is φ = 61834500000.

The previous prime is 78203831243. The next prime is 78203831297. The reversal of 78203831251 is 15213830287.

It is a happy number.

It is not a de Polignac number, because 78203831251 - 2³ = 78203831243 is a prime.

It is a super-2 number, since 2×78203831251² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78203831051) 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, 146875 + ... + 421876.

It is an arithmetic number, because the mean of its divisors is an integer number (6019671168).

Almost surely, 2^78203831251 is an apocalyptic number.

78203831251 is a deficient number, since it is larger than the sum of its proper divisors (18110907437).

78203831251 is a wasteful number, since it uses less digits than its factorization.

78203831251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570282.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 78203831251 in words is "seventy-eight billion, two hundred three million, eight hundred thirty-one thousand, two hundred fifty-one".