15858649349 has 2 divisors, whose sum is σ = 15858649350. Its totient is φ = 15858649348.

The previous prime is 15858649343. The next prime is 15858649379. The reversal of 15858649349 is 94394685851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15827401249 + 31248100 = 125807^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 15858649349 - 2¹⁶ = 15858583813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15858649291 and 15858649300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15858649343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7929324674 + 7929324675.

It is an arithmetic number, because the mean of its divisors is an integer number (7929324675).

Almost surely, 2^15858649349 is an apocalyptic number.

It is an amenable number.

15858649349 is a deficient number, since it is larger than the sum of its proper divisors (1).

15858649349 is an equidigital number, since it uses as much as digits as its factorization.

15858649349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 62.

The spelling of 15858649349 in words is "fifteen billion, eight hundred fifty-eight million, six hundred forty-nine thousand, three hundred forty-nine".