1540252555 has 4 divisors (see below), whose sum is σ = 1848303072. Its totient is φ = 1232202040.

The previous prime is 1540252541. The next prime is 1540252573. The reversal of 1540252555 is 5552520451.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1540252555 - 2¹⁷ = 1540121483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1540252555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154025251 + ... + 154025260.

It is an arithmetic number, because the mean of its divisors is an integer number (462075768).

Almost surely, 2^1540252555 is an apocalyptic number.

1540252555 is a deficient number, since it is larger than the sum of its proper divisors (308050517).

1540252555 is an equidigital number, since it uses as much as digits as its factorization.

1540252555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308050516.

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 1540252555 is about 39246.0514574396. The cubic root of 1540252555 is about 1154.8634746770.

The spelling of 1540252555 in words is "one billion, five hundred forty million, two hundred fifty-two thousand, five hundred fifty-five".