991772698754 has 16 divisors (see below), whose sum is σ = 1519362717696. Its totient is φ = 485319172800.

The previous prime is 991772698753. The next prime is 991772698757. The reversal of 991772698754 is 457896277199.

It is a happy number.

It is a super-2 number, since 2×991772698754² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991772698753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2898719 + ... + 3222749.

It is an arithmetic number, because the mean of its divisors is an integer number (94960169856).

Almost surely, 2^991772698754 is an apocalyptic number.

991772698754 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

991772698754 is a deficient number, since it is larger than the sum of its proper divisors (527590018942).

991772698754 is a wasteful number, since it uses less digits than its factorization.

991772698754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356641.

The product of its digits is 480090240, while the sum is 74.

The spelling of 991772698754 in words is "nine hundred ninety-one billion, seven hundred seventy-two million, six hundred ninety-eight thousand, seven hundred fifty-four".