1401665252539 has 4 divisors (see below), whose sum is σ = 1435852209960. Its totient is φ = 1367478295120.

The previous prime is 1401665252497. The next prime is 1401665252593. The reversal of 1401665252539 is 9352525661041.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1401665252539 - 2⁹ = 1401665252027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1401665252492 and 1401665252501.

It is not an unprimeable number, because it can be changed into a prime (1401665252639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17093478649 + ... + 17093478730.

It is an arithmetic number, because the mean of its divisors is an integer number (358963052490).

Almost surely, 2^{1401665252539} is an apocalyptic number.

1401665252539 is a deficient number, since it is larger than the sum of its proper divisors (34186957421).

1401665252539 is an equidigital number, since it uses as much as digits as its factorization.

1401665252539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34186957420.

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 1401665252539 in words is "one trillion, four hundred one billion, six hundred sixty-five million, two hundred fifty-two thousand, five hundred thirty-nine".