215802366451 has 4 divisors (see below), whose sum is σ = 246631275952. Its totient is φ = 184973456952.

The previous prime is 215802366449. The next prime is 215802366469. The reversal of 215802366451 is 154663208512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215802366451 - 2¹ = 215802366449 is a prime.

It is a super-2 number, since 2×215802366451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215802366398 and 215802366407.

It is not an unprimeable number, because it can be changed into a prime (215802366551) 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, 15414454740 + ... + 15414454753.

It is an arithmetic number, because the mean of its divisors is an integer number (61657818988).

Almost surely, 2^215802366451 is an apocalyptic number.

215802366451 is a deficient number, since it is larger than the sum of its proper divisors (30828909501).

215802366451 is an equidigital number, since it uses as much as digits as its factorization.

215802366451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30828909500.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 215802366451 in words is "two hundred fifteen billion, eight hundred two million, three hundred sixty-six thousand, four hundred fifty-one".