656199901 has 8 divisors (see below), whose sum is σ = 751062464. Its totient is φ = 561617280.

The previous prime is 656199893. The next prime is 656199917. The reversal of 656199901 is 109991656.

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

It is not a de Polignac number, because 656199901 - 2³ = 656199893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656199001) 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, 64935 + ... + 74356.

It is an arithmetic number, because the mean of its divisors is an integer number (93882808).

Almost surely, 2^656199901 is an apocalyptic number.

It is an amenable number.

656199901 is a deficient number, since it is larger than the sum of its proper divisors (94862563).

656199901 is a wasteful number, since it uses less digits than its factorization.

656199901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139971.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 656199901 is about 25616.3990638809. The cubic root of 656199901 is about 868.9845469498.

The spelling of 656199901 in words is "six hundred fifty-six million, one hundred ninety-nine thousand, nine hundred one".