3861821545648 has 40 divisors (see below), whose sum is σ = 8173714348800. Its totient is φ = 1752958827840.

The previous prime is 3861821545633. The next prime is 3861821545651. The reversal of 3861821545648 is 8465451281683.

It is a super-2 number, since 2×3861821545648² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14962948 + ... + 15218851.

It is an arithmetic number, because the mean of its divisors is an integer number (204342858720).

Almost surely, 2^{3861821545648} is an apocalyptic number.

It is an amenable number.

3861821545648 is an abundant number, since it is smaller than the sum of its proper divisors (4311892803152).

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

3861821545648 is a wasteful number, since it uses less digits than its factorization.

3861821545648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30182545 (or 30182539 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 61.

The spelling of 3861821545648 in words is "three trillion, eight hundred sixty-one billion, eight hundred twenty-one million, five hundred forty-five thousand, six hundred forty-eight".