78019620451 has 2 divisors, whose sum is σ = 78019620452. Its totient is φ = 78019620450.

The previous prime is 78019620443. The next prime is 78019620529. The reversal of 78019620451 is 15402691087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78019620451 - 2³ = 78019620443 is a prime.

It is a super-2 number, since 2×78019620451² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78019620398 and 78019620407.

It is not a weakly prime, because it can be changed into another prime (78019620401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39009810225 + 39009810226.

It is an arithmetic number, because the mean of its divisors is an integer number (39009810226).

Almost surely, 2^78019620451 is an apocalyptic number.

78019620451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78019620451 is an equidigital number, since it uses as much as digits as its factorization.

78019620451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 78019620451 in words is "seventy-eight billion, nineteen million, six hundred twenty thousand, four hundred fifty-one".