991759748962 has 4 divisors (see below), whose sum is σ = 1487639623446. Its totient is φ = 495879874480.

The previous prime is 991759748953. The next prime is 991759748983. The reversal of 991759748962 is 269847957199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 269847957199 = 17 ⋅15873409247.

It can be written as a sum of positive squares in only one way, i.e., 731283232801 + 260476516161 = 855151^2 + 510369^2 .

It is a super-2 number, since 2×991759748962² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247939937239 + ... + 247939937242.

Almost surely, 2^991759748962 is an apocalyptic number.

991759748962 is a deficient number, since it is larger than the sum of its proper divisors (495879874484).

991759748962 is a wasteful number, since it uses less digits than its factorization.

991759748962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495879874483.

The product of its digits is 617258880, while the sum is 76.

The spelling of 991759748962 in words is "nine hundred ninety-one billion, seven hundred fifty-nine million, seven hundred forty-eight thousand, nine hundred sixty-two".