1665960726040 has 64 divisors (see below), whose sum is σ = 4135208384160. Its totient is φ = 600120929280.

The previous prime is 1665960725983. The next prime is 1665960726047. The reversal of 1665960726040 is 406270695661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665960726047) 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, 39049054 + ... + 39091693.

Almost surely, 2^{1665960726040} is an apocalyptic number.

1665960726040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665960726040 is an abundant number, since it is smaller than the sum of its proper divisors (2469247658120).

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

1665960726040 is a wasteful number, since it uses less digits than its factorization.

1665960726040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78140812 (or 78140808 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 1665960726040 in words is "one trillion, six hundred sixty-five billion, nine hundred sixty million, seven hundred twenty-six thousand, forty".