66551101515 has 12 divisors (see below), whose sum is σ = 115355242704. Its totient is φ = 35493920784.

The previous prime is 66551101483. The next prime is 66551101601. The reversal of 66551101515 is 51510115566.

It is a happy number.

It is not a de Polignac number, because 66551101515 - 2⁵ = 66551101483 is a prime.

It is a super-2 number, since 2×66551101515² (a number of 22 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 66551101515.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 739456639 + ... + 739456728.

It is an arithmetic number, because the mean of its divisors is an integer number (9612936892).

Almost surely, 2^66551101515 is an apocalyptic number.

66551101515 is a deficient number, since it is larger than the sum of its proper divisors (48804141189).

66551101515 is a wasteful number, since it uses less digits than its factorization.

66551101515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478913378 (or 1478913375 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 66551101515 in words is "sixty-six billion, five hundred fifty-one million, one hundred one thousand, five hundred fifteen".