1636742777364 has 144 divisors (see below), whose sum is σ = 4402975449600. Its totient is φ = 511794651648.

The previous prime is 1636742777363. The next prime is 1636742777381. The reversal of 1636742777364 is 4637772476361.

1636742777364 is a `hidden beast` number, since 163 + 6 + 7 + 42 + 7 + 77 + 364 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636742777363) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6600577 + ... + 6844055.

It is an arithmetic number, because the mean of its divisors is an integer number (30576218400).

Almost surely, 2^{1636742777364} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1636742777364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2201487724800).

1636742777364 is an abundant number, since it is smaller than the sum of its proper divisors (2766232672236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1636742777364 is a wasteful number, since it uses less digits than its factorization.

1636742777364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243702 (or 243697 counting only the distinct ones).

The product of its digits is 149361408, while the sum is 63.

The spelling of 1636742777364 in words is "one trillion, six hundred thirty-six billion, seven hundred forty-two million, seven hundred seventy-seven thousand, three hundred sixty-four".