1612419975721 has 9 divisors (see below), whose sum is σ = 1652759859799. Its totient is φ = 1573041866800.

The previous prime is 1612419975709. The next prime is 1612419975767. The reversal of 1612419975721 is 1275799142161.

The square root of 1612419975721 is 1269811.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 77695430121 + 1534724545600 = 278739^2 + 1238840^2 .

It is not a de Polignac number, because 1612419975721 - 2⁵ = 1612419975689 is a prime.

It is a super-2 number, since 2×1612419975721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612419975821) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52046766 + ... + 52077736.

Almost surely, 2^{1612419975721} is an apocalyptic number.

1612419975721 is the 1269811-st square number.

1612419975721 is the 634906-th centered octagonal number.

It is an amenable number.

1612419975721 is a deficient number, since it is larger than the sum of its proper divisors (40339884078).

1612419975721 is an frugal number, since it uses more digits than its factorization.

1612419975721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62024 (or 31012 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 55.

The spelling of 1612419975721 in words is "one trillion, six hundred twelve billion, four hundred nineteen million, nine hundred seventy-five thousand, seven hundred twenty-one".