1257764639447 has 4 divisors (see below), whose sum is σ = 1257771587376. Its totient is φ = 1257757691520.

The previous prime is 1257764639441. The next prime is 1257764639459. The reversal of 1257764639447 is 7449364677521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257764639447 - 2²² = 1257760445143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257764639441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3194954 + ... + 3566967.

It is an arithmetic number, because the mean of its divisors is an integer number (314442896844).

Almost surely, 2^{1257764639447} is an apocalyptic number.

1257764639447 is a deficient number, since it is larger than the sum of its proper divisors (6947929).

1257764639447 is an equidigital number, since it uses as much as digits as its factorization.

1257764639447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947928.

The product of its digits is 213373440, while the sum is 65.

The spelling of 1257764639447 in words is "one trillion, two hundred fifty-seven billion, seven hundred sixty-four million, six hundred thirty-nine thousand, four hundred forty-seven".