661928711 has 8 divisors (see below), whose sum is σ = 711327600. Its totient is φ = 613692288.

The previous prime is 661928693. The next prime is 661928717. The reversal of 661928711 is 117829166.

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 661928711 - 2¹⁸ = 661666567 is a prime.

It is a super-2 number, since 2×661928711² = 876299236892243042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661928717) 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, 289436 + ... + 291713.

It is an arithmetic number, because the mean of its divisors is an integer number (88915950).

Almost surely, 2^661928711 is an apocalyptic number.

661928711 is a deficient number, since it is larger than the sum of its proper divisors (49398889).

661928711 is a wasteful number, since it uses less digits than its factorization.

661928711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581233.

The product of its digits is 36288, while the sum is 41.

The square root of 661928711 is about 25727.9752604048. The cubic root of 661928711 is about 871.5060499482.

The spelling of 661928711 in words is "six hundred sixty-one million, nine hundred twenty-eight thousand, seven hundred eleven".