2157936451658 has 8 divisors (see below), whose sum is σ = 3485897345028. Its totient is φ = 995970669984.

The previous prime is 2157936451577. The next prime is 2157936451663. The reversal of 2157936451658 is 8561546397512.

It can be written as a sum of positive squares in 2 ways, for example, as 1956185457769 + 201750993889 = 1398637^2 + 449167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×2157936451658³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2157936451658.

It is an unprimeable number.

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, 41498777891 + ... + 41498777942.

Almost surely, 2^{2157936451658} is an apocalyptic number.

2157936451658 is a deficient number, since it is larger than the sum of its proper divisors (1327960893370).

2157936451658 is a wasteful number, since it uses less digits than its factorization.

2157936451658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82997555848.

The product of its digits is 54432000, while the sum is 62.

The spelling of 2157936451658 in words is "two trillion, one hundred fifty-seven billion, nine hundred thirty-six million, four hundred fifty-one thousand, six hundred fifty-eight".