1866860736990 has 96 divisors (see below), whose sum is σ = 4959253053216. Its totient is φ = 448173834240.

The previous prime is 1866860736931. The next prime is 1866860736991. The reversal of 1866860736990 is 996370686681.

It is a super-2 number, since 2×1866860736990² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866860736991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3190051 + ... + 3729630.

It is an arithmetic number, because the mean of its divisors is an integer number (51658885971).

Almost surely, 2^{1866860736990} is an apocalyptic number.

1866860736990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1866860736990 is an abundant number, since it is smaller than the sum of its proper divisors (3092392316226).

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

1866860736990 is a wasteful number, since it uses less digits than its factorization.

1866860736990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6919754 (or 6919731 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 69.

The spelling of 1866860736990 in words is "one trillion, eight hundred sixty-six billion, eight hundred sixty million, seven hundred thirty-six thousand, nine hundred ninety".