40042551243 has 16 divisors (see below), whose sum is σ = 56211770880. Its totient is φ = 25284767904.

The previous prime is 40042551239. The next prime is 40042551251. The reversal of 40042551243 is 34215524004.

It is not a de Polignac number, because 40042551243 - 2² = 40042551239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40042551243.

It is not an unprimeable number, because it can be changed into a prime (40042551253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212830 + ... + 354092.

It is an arithmetic number, because the mean of its divisors is an integer number (3513235680).

Almost surely, 2^40042551243 is an apocalyptic number.

40042551243 is a deficient number, since it is larger than the sum of its proper divisors (16169219637).

40042551243 is a wasteful number, since it uses less digits than its factorization.

40042551243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146258.

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 40042551243 in words is "forty billion, forty-two million, five hundred fifty-one thousand, two hundred forty-three".