993905488857 has 12 divisors (see below), whose sum is σ = 1394965636080. Its totient is φ = 627725028672.

The previous prime is 993905488853. The next prime is 993905488861. The reversal of 993905488857 is 758884509399.

It is an interprime number because it is at equal distance from previous prime (993905488853) and next prime (993905488861).

It is not a de Polignac number, because 993905488857 - 2² = 993905488853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (993905488853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7460769 + ... + 7592817.

It is an arithmetic number, because the mean of its divisors is an integer number (116247136340).

Almost surely, 2^993905488857 is an apocalyptic number.

It is an amenable number.

993905488857 is a deficient number, since it is larger than the sum of its proper divisors (401060147223).

993905488857 is an frugal number, since it uses more digits than its factorization.

993905488857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264120 (or 132071 counting only the distinct ones).

The product of its (nonzero) digits is 783820800, while the sum is 75.

The spelling of 993905488857 in words is "nine hundred ninety-three billion, nine hundred five million, four hundred eighty-eight thousand, eight hundred fifty-seven".