1377555258249 has 9 divisors (see below), whose sum is σ = 1989807125709. Its totient is φ = 918367824780.

The previous prime is 1377555258223. The next prime is 1377555258257. The reversal of 1377555258249 is 9428525557731.

The square root of 1377555258249 is 1173693.

It is a perfect power (a square), and thus also a powerful number.

1377555258249 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 5 + 5 + 5 + 2 + 582 + 49 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1377555258249 - 2¹⁵ = 1377555225481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1377555258269) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3325464 + ... + 3716694.

Almost surely, 2^{1377555258249} is an apocalyptic number.

1377555258249 is the 1173693-rd square number.

1377555258249 is the 586847-th centered octagonal number.

It is an amenable number.

1377555258249 is a deficient number, since it is larger than the sum of its proper divisors (612251867460).

1377555258249 is an frugal number, since it uses more digits than its factorization.

1377555258249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782468 (or 391234 counting only the distinct ones).

The product of its digits is 105840000, while the sum is 63.

The spelling of 1377555258249 in words is "one trillion, three hundred seventy-seven billion, five hundred fifty-five million, two hundred fifty-eight thousand, two hundred forty-nine".