78408402361 has 4 divisors (see below), whose sum is σ = 82535160400. Its totient is φ = 74281644324.

The previous prime is 78408402311. The next prime is 78408402383. The reversal of 78408402361 is 16320480487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16320480487 = 67 ⋅243589261.

It is a cyclic number.

It is not a de Polignac number, because 78408402361 - 2²⁷ = 78274184633 is a prime.

It is a super-2 number, since 2×78408402361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78408402311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063378991 + ... + 2063379028.

It is an arithmetic number, because the mean of its divisors is an integer number (20633790100).

Almost surely, 2^78408402361 is an apocalyptic number.

It is an amenable number.

78408402361 is a deficient number, since it is larger than the sum of its proper divisors (4126758039).

78408402361 is a wasteful number, since it uses less digits than its factorization.

78408402361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126758038.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 78408402361 in words is "seventy-eight billion, four hundred eight million, four hundred two thousand, three hundred sixty-one".