66637741653 has 24 divisors (see below), whose sum is σ = 111647035968. Its totient is φ = 37510368192.

The previous prime is 66637741649. The next prime is 66637741657. The reversal of 66637741653 is 35614773666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66637741649) and next prime (66637741657).

It is not a de Polignac number, because 66637741653 - 2² = 66637741649 is a prime.

It is a super-2 number, since 2×66637741653² (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 66637741653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66637741657) 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, 7889376 + ... + 7897817.

It is an arithmetic number, because the mean of its divisors is an integer number (4651959832).

Almost surely, 2^66637741653 is an apocalyptic number.

66637741653 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

66637741653 is a deficient number, since it is larger than the sum of its proper divisors (45009294315).

66637741653 is a wasteful number, since it uses less digits than its factorization.

66637741653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15787273 (or 15787270 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 54.

The spelling of 66637741653 in words is "sixty-six billion, six hundred thirty-seven million, seven hundred forty-one thousand, six hundred fifty-three".