649249802045 has 54 divisors (see below), whose sum is σ = 861505885422. Its totient is φ = 469500430464.

The previous prime is 649249802023. The next prime is 649249802083. The reversal of 649249802045 is 540208942946.

It can be written as a sum of positive squares in 9 ways, for example, as 222544288516 + 426705513529 = 471746^2 + 653227^2 .

It is a de Polignac number, because none of the positive numbers 2^k-649249802045 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1241395154 + ... + 1241395676.

It is an arithmetic number, because the mean of its divisors is an integer number (15953812693).

Almost surely, 2^649249802045 is an apocalyptic number.

649249802045 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

649249802045 is a deficient number, since it is larger than the sum of its proper divisors (212256083377).

649249802045 is an frugal number, since it uses more digits than its factorization.

649249802045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 649249802045 in words is "six hundred forty-nine billion, two hundred forty-nine million, eight hundred two thousand, forty-five".