3987768500645 has 8 divisors (see below), whose sum is σ = 5066811742104. Its totient is φ = 3002555106304.

The previous prime is 3987768500633. The next prime is 3987768500689. The reversal of 3987768500645 is 5460058677893.

It can be written as a sum of positive squares in 4 ways, for example, as 424798918756 + 3562969581889 = 651766^2 + 1887583^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3987768500645 - 2²² = 3987764306341 is a prime.

It is a super-2 number, since 2×3987768500645² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 23457461684 + ... + 23457461853.

It is an arithmetic number, because the mean of its divisors is an integer number (633351467763).

Almost surely, 2^{3987768500645} is an apocalyptic number.

It is an amenable number.

3987768500645 is a deficient number, since it is larger than the sum of its proper divisors (1079043241459).

3987768500645 is a wasteful number, since it uses less digits than its factorization.

3987768500645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46914923559.

The product of its (nonzero) digits is 304819200, while the sum is 68.

The spelling of 3987768500645 in words is "three trillion, nine hundred eighty-seven billion, seven hundred sixty-eight million, five hundred thousand, six hundred forty-five".