78650793646 has 4 divisors (see below), whose sum is σ = 117976190472. Its totient is φ = 39325396822.

The previous prime is 78650793643. The next prime is 78650793659. The reversal of 78650793646 is 64639705687.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78650793646² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78650793643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19662698410 + ... + 19662698413.

It is an arithmetic number, because the mean of its divisors is an integer number (29494047618).

Almost surely, 2^78650793646 is an apocalyptic number.

78650793646 is a deficient number, since it is larger than the sum of its proper divisors (39325396826).

78650793646 is a wasteful number, since it uses less digits than its factorization.

78650793646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39325396825.

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 78650793646 in words is "seventy-eight billion, six hundred fifty million, seven hundred ninety-three thousand, six hundred forty-six".