1251512730478 has 16 divisors (see below), whose sum is σ = 1890322509600. Its totient is φ = 621407952000.

The previous prime is 1251512730469. The next prime is 1251512730499. The reversal of 1251512730478 is 8740372151521.

It is a super-2 number, since 2×1251512730478² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241218 + ... + 1600378.

It is an arithmetic number, because the mean of its divisors is an integer number (118145156850).

Almost surely, 2^{1251512730478} is an apocalyptic number.

1251512730478 is a deficient number, since it is larger than the sum of its proper divisors (638809779122).

1251512730478 is a wasteful number, since it uses less digits than its factorization.

1251512730478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362363.

The product of its (nonzero) digits is 470400, while the sum is 46.

Adding to 1251512730478 its reverse (8740372151521), we get a palindrome (9991884881999).

The spelling of 1251512730478 in words is "one trillion, two hundred fifty-one billion, five hundred twelve million, seven hundred thirty thousand, four hundred seventy-eight".