661860290807 has 8 divisors (see below), whose sum is σ = 662709880656. Its totient is φ = 661010821632.

The previous prime is 661860290753. The next prime is 661860290827. The reversal of 661860290807 is 708092068166.

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 661860290807 - 2⁸ = 661860290551 is a prime.

It is a super-2 number, since 2×661860290807² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661860290827) 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, 16961303 + ... + 17000279.

It is an arithmetic number, because the mean of its divisors is an integer number (82838735082).

Almost surely, 2^661860290807 is an apocalyptic number.

661860290807 is a deficient number, since it is larger than the sum of its proper divisors (849589849).

661860290807 is a wasteful number, since it uses less digits than its factorization.

661860290807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60337.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 661860290807 in words is "six hundred sixty-one billion, eight hundred sixty million, two hundred ninety thousand, eight hundred seven".