1157665533661 has 16 divisors (see below), whose sum is σ = 1436038180864. Its totient is φ = 908742893184.

The previous prime is 1157665533637. The next prime is 1157665533677. The reversal of 1157665533661 is 1663355667511.

It is not a de Polignac number, because 1157665533661 - 2⁷ = 1157665533533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157665533691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50073480 + ... + 50096593.

It is an arithmetic number, because the mean of its divisors is an integer number (89752386304).

Almost surely, 2^{1157665533661} is an apocalyptic number.

It is an amenable number.

1157665533661 is a deficient number, since it is larger than the sum of its proper divisors (278372647203).

1157665533661 is a wasteful number, since it uses less digits than its factorization.

1157665533661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100170220.

The product of its digits is 10206000, while the sum is 55.

The spelling of 1157665533661 in words is "one trillion, one hundred fifty-seven billion, six hundred sixty-five million, five hundred thirty-three thousand, six hundred sixty-one".