1420202107557 has 6 divisors (see below), whose sum is σ = 2051403044262. Its totient is φ = 946801405032.

The previous prime is 1420202107553. The next prime is 1420202107559. The reversal of 1420202107557 is 7557012020241.

It can be written as a sum of positive squares in only one way, i.e., 1052540572356 + 367661535201 = 1025934^2 + 606351^2 .

It is not a de Polignac number, because 1420202107557 - 2² = 1420202107553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420202107553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78900117078 + ... + 78900117095.

It is an arithmetic number, because the mean of its divisors is an integer number (341900507377).

Almost surely, 2^{1420202107557} is an apocalyptic number.

It is an amenable number.

1420202107557 is a deficient number, since it is larger than the sum of its proper divisors (631200936705).

1420202107557 is a wasteful number, since it uses less digits than its factorization.

1420202107557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157800234179 (or 157800234176 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

Adding to 1420202107557 its reverse (7557012020241), we get a palindrome (8977214127798).

The spelling of 1420202107557 in words is "one trillion, four hundred twenty billion, two hundred two million, one hundred seven thousand, five hundred fifty-seven".