77494543251 has 16 divisors (see below), whose sum is σ = 106308454560. Its totient is φ = 50182836480.

The previous prime is 77494543237. The next prime is 77494543253. The reversal of 77494543251 is 15234549477.

It is a happy number.

It is not a de Polignac number, because 77494543251 - 2²⁹ = 76957672339 is a prime.

It is a super-2 number, since 2×77494543251² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77494543194 and 77494543203.

It is not an unprimeable number, because it can be changed into a prime (77494543253) 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, 1347460 + ... + 1403793.

It is an arithmetic number, because the mean of its divisors is an integer number (6644278410).

Almost surely, 2^77494543251 is an apocalyptic number.

77494543251 is a deficient number, since it is larger than the sum of its proper divisors (28813911309).

77494543251 is a wasteful number, since it uses less digits than its factorization.

77494543251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751526.

The product of its digits is 4233600, while the sum is 51.

The spelling of 77494543251 in words is "seventy-seven billion, four hundred ninety-four million, five hundred forty-three thousand, two hundred fifty-one".