1252020681616 has 10 divisors (see below), whose sum is σ = 2425790070662. Its totient is φ = 626010340800.

The previous prime is 1252020681599. The next prime is 1252020681617. The reversal of 1252020681616 is 6161860202521.

It can be written as a sum of positive squares in only one way, i.e., 1221467040000 + 30553641616 = 1105200^2 + 174796^2 .

It is not an unprimeable number, because it can be changed into a prime (1252020681617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39125646285 + ... + 39125646316.

Almost surely, 2^{1252020681616} is an apocalyptic number.

1252020681616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1252020681616 is a deficient number, since it is larger than the sum of its proper divisors (1173769389046).

1252020681616 is an equidigital number, since it uses as much as digits as its factorization.

1252020681616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78251292609 (or 78251292603 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 1252020681616 in words is "one trillion, two hundred fifty-two billion, twenty million, six hundred eighty-one thousand, six hundred sixteen".