387668721049 has 2 divisors, whose sum is σ = 387668721050. Its totient is φ = 387668721048.

The previous prime is 387668721031. The next prime is 387668721059. The reversal of 387668721049 is 940127866783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383448269824 + 4220451225 = 619232^2 + 64965^2 .

It is a cyclic number.

It is not a de Polignac number, because 387668721049 - 2¹³ = 387668712857 is a prime.

It is not a weakly prime, because it can be changed into another prime (387668721059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193834360524 + 193834360525.

It is an arithmetic number, because the mean of its divisors is an integer number (193834360525).

Almost surely, 2^387668721049 is an apocalyptic number.

It is an amenable number.

387668721049 is a deficient number, since it is larger than the sum of its proper divisors (1).

387668721049 is an equidigital number, since it uses as much as digits as its factorization.

387668721049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 387668721049 in words is "three hundred eighty-seven billion, six hundred sixty-eight million, seven hundred twenty-one thousand, forty-nine".