1557598643950 has 12 divisors (see below), whose sum is σ = 2897133477840. Its totient is φ = 623039457560.

The previous prime is 1557598643929. The next prime is 1557598643959. The reversal of 1557598643950 is 593468957551.

It is a super-2 number, since 2×1557598643950² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557598643959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15575986390 + ... + 15575986489.

It is an arithmetic number, because the mean of its divisors is an integer number (241427789820).

Almost surely, 2^{1557598643950} is an apocalyptic number.

1557598643950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1557598643950 is a deficient number, since it is larger than the sum of its proper divisors (1339534833890).

1557598643950 is a wasteful number, since it uses less digits than its factorization.

1557598643950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31151972891 (or 31151972886 counting only the distinct ones).

The product of its (nonzero) digits is 204120000, while the sum is 67.

The spelling of 1557598643950 in words is "one trillion, five hundred fifty-seven billion, five hundred ninety-eight million, six hundred forty-three thousand, nine hundred fifty".