40002561530 has 32 divisors (see below), whose sum is σ = 72219288960. Its totient is φ = 15953379520.

The previous prime is 40002561439. The next prime is 40002561539. The reversal of 40002561530 is 3516520004.

40002561530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40002561530² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40002561530.

It is not an unprimeable number, because it can be changed into a prime (40002561539) 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, 7053536 + ... + 7059204.

It is an arithmetic number, because the mean of its divisors is an integer number (2256852780).

Almost surely, 2^40002561530 is an apocalyptic number.

40002561530 is a deficient number, since it is larger than the sum of its proper divisors (32216727430).

40002561530 is a wasteful number, since it uses less digits than its factorization.

40002561530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 40002561530 in words is "forty billion, two million, five hundred sixty-one thousand, five hundred thirty".