991600648355 has 8 divisors (see below), whose sum is σ = 1189940341392. Its totient is φ = 793267476448.

The previous prime is 991600648327. The next prime is 991600648373. The reversal of 991600648355 is 553846006199.

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 991600648355 - 2¹⁴ = 991600631971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991600648355.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289264 + ... + 1909293.

It is an arithmetic number, because the mean of its divisors is an integer number (148742542674).

Almost surely, 2^991600648355 is an apocalyptic number.

991600648355 is a deficient number, since it is larger than the sum of its proper divisors (198339693037).

991600648355 is a wasteful number, since it uses less digits than its factorization.

991600648355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260565.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 991600648355 in words is "nine hundred ninety-one billion, six hundred million, six hundred forty-eight thousand, three hundred fifty-five".