66354354869495 has 24 divisors (see below), whose sum is σ = 100025077098912. Its totient is φ = 41363753682240.

The previous prime is 66354354869459. The next prime is 66354354869497. The reversal of 66354354869495 is 59496845345366.

It is not a de Polignac number, because 66354354869495 - 2²⁰ = 66354353820919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (77).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66354354869497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7834040024 + ... + 7834048493.

It is an arithmetic number, because the mean of its divisors is an integer number (4167711545788).

Almost surely, 2^{66354354869495} is an apocalyptic number.

66354354869495 is a deficient number, since it is larger than the sum of its proper divisors (33670722229417).

66354354869495 is a wasteful number, since it uses less digits than its factorization.

66354354869495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15668088551 (or 15668088540 counting only the distinct ones).

The product of its digits is 10077696000, while the sum is 77.

The spelling of 66354354869495 in words is "sixty-six trillion, three hundred fifty-four billion, three hundred fifty-four million, eight hundred sixty-nine thousand, four hundred ninety-five".