2101606615557 has 24 divisors (see below), whose sum is σ = 3195518345760. Its totient is φ = 1327291829280.

The previous prime is 2101606615553. The next prime is 2101606615579. The reversal of 2101606615557 is 7555166061012.

It is a happy number.

2101606615557 is a `hidden beast` number, since 2 + 10 + 16 + 0 + 6 + 615 + 5 + 5 + 7 = 666.

It is not a de Polignac number, because 2101606615557 - 2² = 2101606615553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101606615553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6417058 + ... + 6736604.

It is an arithmetic number, because the mean of its divisors is an integer number (133146597740).

Almost surely, 2^{2101606615557} is an apocalyptic number.

It is an amenable number.

2101606615557 is a deficient number, since it is larger than the sum of its proper divisors (1093911730203).

2101606615557 is a wasteful number, since it uses less digits than its factorization.

2101606615557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358033 (or 358030 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 2101606615557 in words is "two trillion, one hundred one billion, six hundred six million, six hundred fifteen thousand, five hundred fifty-seven".