66677177009531 has 4 divisors (see below), whose sum is σ = 72738738555864. Its totient is φ = 60615615463200.

The previous prime is 66677177009519. The next prime is 66677177009543. The reversal of 66677177009531 is 13590077177666.

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

It is an interprime number because it is at equal distance from previous prime (66677177009519) and next prime (66677177009543).

It is a cyclic number.

It is not a de Polignac number, because 66677177009531 - 2³⁰ = 66676103267707 is a prime.

It is a super-2 number, since 2×66677177009531² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66677177009561) 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, 3030780773150 + ... + 3030780773171.

It is an arithmetic number, because the mean of its divisors is an integer number (18184684638966).

Almost surely, 2^{66677177009531} is an apocalyptic number.

66677177009531 is a deficient number, since it is larger than the sum of its proper divisors (6061561546333).

66677177009531 is a wasteful number, since it uses less digits than its factorization.

66677177009531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061561546332.

The product of its (nonzero) digits is 70013160, while the sum is 65.

The spelling of 66677177009531 in words is "sixty-six trillion, six hundred seventy-seven billion, one hundred seventy-seven million, nine thousand, five hundred thirty-one".