78661563412 has 12 divisors (see below), whose sum is σ = 140859078976. Its totient is φ = 38416112280.

The previous prime is 78661563317. The next prime is 78661563427. The reversal of 78661563412 is 21436516687.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228667164 + ... + 228667507.

Almost surely, 2^78661563412 is an apocalyptic number.

It is an amenable number.

78661563412 is a deficient number, since it is larger than the sum of its proper divisors (62197515564).

78661563412 is a wasteful number, since it uses less digits than its factorization.

78661563412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457334718 (or 457334716 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 78661563412 in words is "seventy-eight billion, six hundred sixty-one million, five hundred sixty-three thousand, four hundred twelve".