1257203140506 has 80 divisors (see below), whose sum is σ = 2873853924480. Its totient is φ = 410690679840.

The previous prime is 1257203140481. The next prime is 1257203140511. The reversal of 1257203140506 is 6050413027521.

1257203140506 is a `hidden beast` number, since 1 + 2 + 5 + 7 + 2 + 0 + 3 + 140 + 506 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1593580 + ... + 2248088.

It is an arithmetic number, because the mean of its divisors is an integer number (35923174056).

Almost surely, 2^{1257203140506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257203140506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1436926962240).

1257203140506 is an abundant number, since it is smaller than the sum of its proper divisors (1616650783974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1257203140506 is a wasteful number, since it uses less digits than its factorization.

1257203140506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654761 (or 654752 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 1257203140506 in words is "one trillion, two hundred fifty-seven billion, two hundred three million, one hundred forty thousand, five hundred six".