1263621351545 has 16 divisors (see below), whose sum is σ = 1739089994880. Its totient is φ = 863421427584.

The previous prime is 1263621351541. The next prime is 1263621351583. The reversal of 1263621351545 is 5451531263621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1263621351545 - 2² = 1263621351541 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1263621351496 and 1263621351505.

It is not an unprimeable number, because it can be changed into a prime (1263621351541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63777140 + ... + 63796949.

It is an arithmetic number, because the mean of its divisors is an integer number (108693124680).

Almost surely, 2^{1263621351545} is an apocalyptic number.

It is an amenable number.

1263621351545 is a deficient number, since it is larger than the sum of its proper divisors (475468643335).

1263621351545 is a wasteful number, since it uses less digits than its factorization.

1263621351545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127574384.

The product of its digits is 648000, while the sum is 44.

The spelling of 1263621351545 in words is "one trillion, two hundred sixty-three billion, six hundred twenty-one million, three hundred fifty-one thousand, five hundred forty-five".