745556517840 has 40 divisors (see below), whose sum is σ = 2311225206048. Its totient is φ = 198815071360.

The previous prime is 745556517829. The next prime is 745556517841. The reversal of 745556517840 is 48715655547.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745556517841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1553242506 + ... + 1553242985.

Almost surely, 2^745556517840 is an apocalyptic number.

It is an amenable number.

745556517840 is an abundant number, since it is smaller than the sum of its proper divisors (1565668688208).

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

745556517840 is a wasteful number, since it uses less digits than its factorization.

745556517840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106485507 (or 3106485501 counting only the distinct ones).

The product of its (nonzero) digits is 23520000, while the sum is 57.

The spelling of 745556517840 in words is "seven hundred forty-five billion, five hundred fifty-six million, five hundred seventeen thousand, eight hundred forty".