1256724097550 has 48 divisors (see below), whose sum is σ = 2404903821840. Its totient is φ = 488243439360.

The previous prime is 1256724097477. The next prime is 1256724097591. The reversal of 1256724097550 is 557904276521.

It is a junction number, because it is equal to n+sod(n) for n = 1256724097492 and 1256724097501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 455717 + ... + 1649583.

It is an arithmetic number, because the mean of its divisors is an integer number (50102162955).

Almost surely, 2^{1256724097550} is an apocalyptic number.

1256724097550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256724097550 is a deficient number, since it is larger than the sum of its proper divisors (1148179724290).

1256724097550 is a wasteful number, since it uses less digits than its factorization.

1256724097550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194485 (or 1194480 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 53.

The spelling of 1256724097550 in words is "one trillion, two hundred fifty-six billion, seven hundred twenty-four million, ninety-seven thousand, five hundred fifty".