43720270637 has 2 divisors, whose sum is σ = 43720270638. Its totient is φ = 43720270636.

The previous prime is 43720270519. The next prime is 43720270661. The reversal of 43720270637 is 73607202734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36789541636 + 6930729001 = 191806^2 + 83251^2 .

It is a cyclic number.

It is not a de Polignac number, because 43720270637 - 2³² = 39425303341 is a prime.

It is a super-2 number, since 2×43720270637² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43720270594 and 43720270603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43720470637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860135318 + 21860135319.

It is an arithmetic number, because the mean of its divisors is an integer number (21860135319).

Almost surely, 2^43720270637 is an apocalyptic number.

It is an amenable number.

43720270637 is a deficient number, since it is larger than the sum of its proper divisors (1).

43720270637 is an equidigital number, since it uses as much as digits as its factorization.

43720270637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 41.

The spelling of 43720270637 in words is "forty-three billion, seven hundred twenty million, two hundred seventy thousand, six hundred thirty-seven".