99944156957 has 4 divisors (see below), whose sum is σ = 100033633596. Its totient is φ = 99854680320.

The previous prime is 99944156951. The next prime is 99944156981. The reversal of 99944156957 is 75965144999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75965144999 = 37 ⋅2053112027.

It can be written as a sum of positive squares in 2 ways, for example, as 3261095236 + 96683061721 = 57106^2 + 310939^2 .

It is a cyclic number.

It is not a de Polignac number, because 99944156957 - 2¹⁶ = 99944091421 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 (99944156951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44736644 + ... + 44738877.

It is an arithmetic number, because the mean of its divisors is an integer number (25008408399).

Almost surely, 2^99944156957 is an apocalyptic number.

It is an amenable number.

99944156957 is a deficient number, since it is larger than the sum of its proper divisors (89476639).

99944156957 is a wasteful number, since it uses less digits than its factorization.

99944156957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89476638.

The product of its digits is 110224800, while the sum is 68.

The spelling of 99944156957 in words is "ninety-nine billion, nine hundred forty-four million, one hundred fifty-six thousand, nine hundred fifty-seven".