1365145551 has 24 divisors (see below), whose sum is σ = 2458445184. Its totient is φ = 709166160.

The previous prime is 1365145541. The next prime is 1365145589. The reversal of 1365145551 is 1555415631.

1365145551 is a `hidden beast` number, since 1 + 3 + 65 + 1 + 45 + 551 = 666.

It is not a de Polignac number, because 1365145551 - 2⁷ = 1365145423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365145511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 984261 + ... + 985646.

It is an arithmetic number, because the mean of its divisors is an integer number (102435216).

Almost surely, 2^1365145551 is an apocalyptic number.

1365145551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1365145551 is a deficient number, since it is larger than the sum of its proper divisors (1093299633).

1365145551 is a wasteful number, since it uses less digits than its factorization.

1365145551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969931 (or 1969928 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 1365145551 is about 36947.8761365251. The cubic root of 1365145551 is about 1109.3271768643.

The spelling of 1365145551 in words is "one billion, three hundred sixty-five million, one hundred forty-five thousand, five hundred fifty-one".