828161191957 has 4 divisors (see below), whose sum is σ = 903448573056. Its totient is φ = 752873810860.

The previous prime is 828161191943. The next prime is 828161191973. The reversal of 828161191957 is 759191161828.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 828161191957 - 2³⁵ = 793801453589 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828161191937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37643690533 + ... + 37643690554.

It is an arithmetic number, because the mean of its divisors is an integer number (225862143264).

Almost surely, 2^828161191957 is an apocalyptic number.

It is an amenable number.

828161191957 is a deficient number, since it is larger than the sum of its proper divisors (75287381099).

828161191957 is a wasteful number, since it uses less digits than its factorization.

828161191957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75287381098.

The product of its digits is 2177280, while the sum is 58.

The spelling of 828161191957 in words is "eight hundred twenty-eight billion, one hundred sixty-one million, one hundred ninety-one thousand, nine hundred fifty-seven".