1612743012521 has 4 divisors (see below), whose sum is σ = 1627815377232. Its totient is φ = 1597670647812.

The previous prime is 1612743012511. The next prime is 1612743012523. The reversal of 1612743012521 is 1252103472161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1612743012521 - 2⁶ = 1612743012457 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612743012523) 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, 7536182195 + ... + 7536182408.

It is an arithmetic number, because the mean of its divisors is an integer number (406953844308).

Almost surely, 2^{1612743012521} is an apocalyptic number.

It is an amenable number.

1612743012521 is a deficient number, since it is larger than the sum of its proper divisors (15072364711).

1612743012521 is a wasteful number, since it uses less digits than its factorization.

1612743012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15072364710.

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 1612743012521 its reverse (1252103472161), we get a palindrome (2864846484682).

The spelling of 1612743012521 in words is "one trillion, six hundred twelve billion, seven hundred forty-three million, twelve thousand, five hundred twenty-one".