1377857064861 has 64 divisors (see below), whose sum is σ = 2176273612800. Its totient is φ = 859570195968.

The previous prime is 1377857064839. The next prime is 1377857064887. The reversal of 1377857064861 is 1684607587731.

1377857064861 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 85 + 70 + 6 + 486 + 1 = 666.

It is not a de Polignac number, because 1377857064861 - 2²⁷ = 1377722847133 is a prime.

It is a super-3 number, since 3×1377857064861³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377857064761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78416685 + ... + 78434253.

It is an arithmetic number, because the mean of its divisors is an integer number (34004275200).

Almost surely, 2^{1377857064861} is an apocalyptic number.

It is an amenable number.

1377857064861 is a deficient number, since it is larger than the sum of its proper divisors (798416547939).

1377857064861 is a wasteful number, since it uses less digits than its factorization.

1377857064861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20335 (or 20329 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 63.

The spelling of 1377857064861 in words is "one trillion, three hundred seventy-seven billion, eight hundred fifty-seven million, sixty-four thousand, eight hundred sixty-one".