1251504545505 has 16 divisors (see below), whose sum is σ = 2002628336064. Its totient is φ = 667395403200.

The previous prime is 1251504545471. The next prime is 1251504545509. The reversal of 1251504545505 is 5055454051521.

It is a happy number.

It is not a de Polignac number, because 1251504545505 - 2⁹ = 1251504544993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251504545509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4464946 + ... + 4736955.

It is an arithmetic number, because the mean of its divisors is an integer number (125164271004).

Almost surely, 2^{1251504545505} is an apocalyptic number.

1251504545505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251504545505 is a deficient number, since it is larger than the sum of its proper divisors (751123790559).

1251504545505 is an equidigital number, since it uses as much as digits as its factorization.

1251504545505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210976.

The product of its (nonzero) digits is 500000, while the sum is 42.

The spelling of 1251504545505 in words is "one trillion, two hundred fifty-one billion, five hundred four million, five hundred forty-five thousand, five hundred five".