1377777640025 has 6 divisors (see below), whose sum is σ = 1708444273662. Its totient is φ = 1102222112000.

The previous prime is 1377777640021. The next prime is 1377777640121. The reversal of 1377777640025 is 5200467777731.

It can be written as a sum of positive squares in 3 ways, for example, as 309260556544 + 1068517083481 = 556112^2 + 1033691^2 .

It is not a de Polignac number, because 1377777640025 - 2² = 1377777640021 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1377777640021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27555552776 + ... + 27555552825.

It is an arithmetic number, because the mean of its divisors is an integer number (284740712277).

Almost surely, 2^{1377777640025} is an apocalyptic number.

It is an amenable number.

1377777640025 is a deficient number, since it is larger than the sum of its proper divisors (330666633637).

1377777640025 is an equidigital number, since it uses as much as digits as its factorization.

1377777640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55111105611 (or 55111105606 counting only the distinct ones).

The product of its (nonzero) digits is 12101040, while the sum is 56.

The spelling of 1377777640025 in words is "one trillion, three hundred seventy-seven billion, seven hundred seventy-seven million, six hundred forty thousand, twenty-five".