78553211651 has 4 divisors (see below), whose sum is σ = 78563652600. Its totient is φ = 78542770704.

The previous prime is 78553211623. The next prime is 78553211699. The reversal of 78553211651 is 15611235587.

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

It is a cyclic number.

It is not a de Polignac number, because 78553211651 - 2²⁶ = 78486102787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78553210651) 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, 5209181 + ... + 5224238.

It is an arithmetic number, because the mean of its divisors is an integer number (19640913150).

Almost surely, 2^78553211651 is an apocalyptic number.

78553211651 is a deficient number, since it is larger than the sum of its proper divisors (10440949).

78553211651 is a wasteful number, since it uses less digits than its factorization.

78553211651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440948.

The product of its digits is 252000, while the sum is 44.

The spelling of 78553211651 in words is "seventy-eight billion, five hundred fifty-three million, two hundred eleven thousand, six hundred fifty-one".