215685420454 has 16 divisors (see below), whose sum is σ = 369752544000. Its totient is φ = 92435081544.

The previous prime is 215685420443. The next prime is 215685420481. The reversal of 215685420454 is 454024586512.

It is a super-2 number, since 2×215685420454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310247 + ... + 1465645.

It is an arithmetic number, because the mean of its divisors is an integer number (23109534000).

Almost surely, 2^215685420454 is an apocalyptic number.

215685420454 is a deficient number, since it is larger than the sum of its proper divisors (154067123546).

215685420454 is a wasteful number, since it uses less digits than its factorization.

215685420454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254547.

The product of its (nonzero) digits is 1536000, while the sum is 46.

The spelling of 215685420454 in words is "two hundred fifteen billion, six hundred eighty-five million, four hundred twenty thousand, four hundred fifty-four".