1555740465 has 24 divisors (see below), whose sum is σ = 2644227840. Its totient is φ = 780918528.

The previous prime is 1555740451. The next prime is 1555740481. The reversal of 1555740465 is 5640475551.

1555740465 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1555740465 - 2⁷ = 1555740337 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175105 + ... + 183774.

It is an arithmetic number, because the mean of its divisors is an integer number (110176160).

Almost surely, 2^1555740465 is an apocalyptic number.

1555740465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555740465 is a deficient number, since it is larger than the sum of its proper divisors (1088487375).

1555740465 is a wasteful number, since it uses less digits than its factorization.

1555740465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358921 (or 358904 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 42.

The square root of 1555740465 is about 39442.8759727280. The cubic root of 1555740465 is about 1158.7214572019.

The spelling of 1555740465 in words is "one billion, five hundred fifty-five million, seven hundred forty thousand, four hundred sixty-five".