978618400751 has 2 divisors, whose sum is σ = 978618400752. Its totient is φ = 978618400750.

The previous prime is 978618400699. The next prime is 978618400759. The reversal of 978618400751 is 157004816879.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978618400751 - 2³⁴ = 961438531567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978618400759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489309200375 + 489309200376.

It is an arithmetic number, because the mean of its divisors is an integer number (489309200376).

Almost surely, 2^978618400751 is an apocalyptic number.

978618400751 is a deficient number, since it is larger than the sum of its proper divisors (1).

978618400751 is an equidigital number, since it uses as much as digits as its factorization.

978618400751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 978618400751 in words is "nine hundred seventy-eight billion, six hundred eighteen million, four hundred thousand, seven hundred fifty-one".