15420456566 has 4 divisors (see below), whose sum is σ = 23130684852. Its totient is φ = 7710228282.

The previous prime is 15420456529. The next prime is 15420456593. The reversal of 15420456566 is 66565402451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66565402451 = 211 ⋅315475841.

It is a super-3 number, since 3×15420456566³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855114140 + ... + 3855114143.

It is an arithmetic number, because the mean of its divisors is an integer number (5782671213).

Almost surely, 2^15420456566 is an apocalyptic number.

15420456566 is a deficient number, since it is larger than the sum of its proper divisors (7710228286).

15420456566 is an equidigital number, since it uses as much as digits as its factorization.

15420456566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7710228285.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 15420456566 in words is "fifteen billion, four hundred twenty million, four hundred fifty-six thousand, five hundred sixty-six".