2125985621776 has 45 divisors (see below), whose sum is σ = 4133145656533. Its totient is φ = 1059379698560.

The previous prime is 2125985621759. The next prime is 2125985621777. The reversal of 2125985621776 is 6771265895212.

It is a happy number.

The square root of 2125985621776 is 1458076.

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., 5583676176 + 2120401945600 = 74724^2 + 1456160^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2125985621777) 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, 2793673236 + ... + 2793673996.

Almost surely, 2^{2125985621776} is an apocalyptic number.

2125985621776 is the 1458076-th square number.

It is an amenable number.

2125985621776 is a deficient number, since it is larger than the sum of its proper divisors (2007160034757).

2125985621776 is an frugal number, since it uses more digits than its factorization.

2125985621776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 1242 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 61.

The spelling of 2125985621776 in words is "two trillion, one hundred twenty-five billion, nine hundred eighty-five million, six hundred twenty-one thousand, seven hundred seventy-six".