78978213662 has 8 divisors (see below), whose sum is σ = 122552400600. Its totient is φ = 38127413464.

The previous prime is 78978213661. The next prime is 78978213667. The reversal of 78978213662 is 26631287987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78978213661) 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, 680846612 + ... + 680846727.

It is an arithmetic number, because the mean of its divisors is an integer number (15319050075).

Almost surely, 2^78978213662 is an apocalyptic number.

78978213662 is a deficient number, since it is larger than the sum of its proper divisors (43574186938).

78978213662 is a wasteful number, since it uses less digits than its factorization.

78978213662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361693370.

The product of its digits is 12192768, while the sum is 59.

The spelling of 78978213662 in words is "seventy-eight billion, nine hundred seventy-eight million, two hundred thirteen thousand, six hundred sixty-two".