1025721621677 has 8 divisors (see below), whose sum is σ = 1109165809536. Its totient is φ = 944844947392.

The previous prime is 1025721621623. The next prime is 1025721621707. The reversal of 1025721621677 is 7761261275201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1025721621677 - 2¹² = 1025721617581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025721621077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641877563 + ... + 641879160.

It is an arithmetic number, because the mean of its divisors is an integer number (138645726192).

Almost surely, 2^{1025721621677} is an apocalyptic number.

1025721621677 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1025721621677 is a deficient number, since it is larger than the sum of its proper divisors (83444187859).

1025721621677 is a wasteful number, since it uses less digits than its factorization.

1025721621677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283756787.

The product of its (nonzero) digits is 493920, while the sum is 47.

Adding to 1025721621677 its reverse (7761261275201), we get a palindrome (8786982896878).

The spelling of 1025721621677 in words is "one trillion, twenty-five billion, seven hundred twenty-one million, six hundred twenty-one thousand, six hundred seventy-seven".