66606151557 has 32 divisors (see below), whose sum is σ = 98649653760. Its totient is φ = 39632457920.

The previous prime is 66606151519. The next prime is 66606151561. The reversal of 66606151557 is 75515160666.

It is not a de Polignac number, because 66606151557 - 2⁷ = 66606151429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606151057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1530298 + ... + 1573220.

It is an arithmetic number, because the mean of its divisors is an integer number (3082801680).

Almost surely, 2^66606151557 is an apocalyptic number.

It is an amenable number.

66606151557 is a deficient number, since it is larger than the sum of its proper divisors (32043502203).

66606151557 is a wasteful number, since it uses less digits than its factorization.

66606151557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43793.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 66606151557 in words is "sixty-six billion, six hundred six million, one hundred fifty-one thousand, five hundred fifty-seven".