2137780297909 has 2 divisors, whose sum is σ = 2137780297910. Its totient is φ = 2137780297908.

The previous prime is 2137780297903. The next prime is 2137780297973. The reversal of 2137780297909 is 9097920877312.

It is an a-pointer prime, because the next prime (2137780297973) can be obtained adding 2137780297909 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1870028900100 + 267751397809 = 1367490^2 + 517447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2137780297909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2137780297903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068890148954 + 1068890148955.

It is an arithmetic number, because the mean of its divisors is an integer number (1068890148955).

Almost surely, 2^{2137780297909} is an apocalyptic number.

It is an amenable number.

2137780297909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2137780297909 is an equidigital number, since it uses as much as digits as its factorization.

2137780297909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24004512, while the sum is 64.

The spelling of 2137780297909 in words is "two trillion, one hundred thirty-seven billion, seven hundred eighty million, two hundred ninety-seven thousand, nine hundred nine".