3861863406645 has 64 divisors (see below), whose sum is σ = 6598936180224. Its totient is φ = 1921831239680.

The previous prime is 3861863406629. The next prime is 3861863406677. The reversal of 3861863406645 is 5466043681683.

It is not a de Polignac number, because 3861863406645 - 2⁴ = 3861863406629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15448600 + ... + 15696590.

It is an arithmetic number, because the mean of its divisors is an integer number (103108377816).

Almost surely, 2^{3861863406645} is an apocalyptic number.

It is an amenable number.

3861863406645 is a deficient number, since it is larger than the sum of its proper divisors (2737072773579).

3861863406645 is a wasteful number, since it uses less digits than its factorization.

3861863406645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248542.

The product of its (nonzero) digits is 59719680, while the sum is 60.

The spelling of 3861863406645 in words is "three trillion, eight hundred sixty-one billion, eight hundred sixty-three million, four hundred six thousand, six hundred forty-five".