71642866651 has 8 divisors (see below), whose sum is σ = 71807574384. Its totient is φ = 71478338400.

The previous prime is 71642866643. The next prime is 71642866657. The reversal of 71642866651 is 15666824617.

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

It is a cyclic number.

It is not a de Polignac number, because 71642866651 - 2³ = 71642866643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71642866657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771325 + ... + 859201.

It is an arithmetic number, because the mean of its divisors is an integer number (8975946798).

Almost surely, 2^71642866651 is an apocalyptic number.

71642866651 is a deficient number, since it is larger than the sum of its proper divisors (164707733).

71642866651 is a wasteful number, since it uses less digits than its factorization.

71642866651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89741.

The product of its digits is 2903040, while the sum is 52.

The spelling of 71642866651 in words is "seventy-one billion, six hundred forty-two million, eight hundred sixty-six thousand, six hundred fifty-one".