2117578403451 has 16 divisors (see below), whose sum is σ = 3367081188864. Its totient is φ = 1157434158144.

The previous prime is 2117578403419. The next prime is 2117578403453. The reversal of 2117578403451 is 1543048757112.

It is not a de Polignac number, because 2117578403451 - 2⁵ = 2117578403419 is a prime.

It is a super-2 number, since 2×2117578403451² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2117578403451.

It is not an unprimeable number, because it can be changed into a prime (2117578403453) 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, 2192109666 + ... + 2192110631.

It is an arithmetic number, because the mean of its divisors is an integer number (210442574304).

Almost surely, 2^{2117578403451} is an apocalyptic number.

2117578403451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2117578403451 is a deficient number, since it is larger than the sum of its proper divisors (1249502785413).

2117578403451 is a wasteful number, since it uses less digits than its factorization.

2117578403451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384220330.

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 2117578403451 in words is "two trillion, one hundred seventeen billion, five hundred seventy-eight million, four hundred three thousand, four hundred fifty-one".