40649371213638 has 64 divisors (see below), whose sum is σ = 88797059481600. Its totient is φ = 12303061263360.

The previous prime is 40649371213603. The next prime is 40649371213657. The reversal of 40649371213638 is 83631217394604.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496173243 + ... + 496255161.

It is an arithmetic number, because the mean of its divisors is an integer number (1387454054400).

Almost surely, 2^{40649371213638} is an apocalyptic number.

40649371213638 is an abundant number, since it is smaller than the sum of its proper divisors (48147688267962).

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

40649371213638 is a wasteful number, since it uses less digits than its factorization.

40649371213638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90957.

The product of its (nonzero) digits is 15676416, while the sum is 57.

The spelling of 40649371213638 in words is "forty trillion, six hundred forty-nine billion, three hundred seventy-one million, two hundred thirteen thousand, six hundred thirty-eight".